February 2025 - people - netdevconf.info

0x19 Tutorial, Debugging increasingly complex virtualized networks with Retis
by Jamal Hadi Salim 06 Feb '25

06 Feb '25

There are many complex paths in the network stack and more are being innovated at a fast pace. The consequence is debugging issues becomes significantly more difficult and time-consuming. Antoine Tenart, Paolo Valerio and Adrián Moreno created Retis to address this challenge and speed up network problem diagnosis. Come learn some of the challenges they faced in a desire to create versatile tooling leading to their main architectural decisions. The instructors will discuss the important features offered by Retis illustrated using simple to complex use cases. More info: https://netdevconf.info/0x19/21 cheers, jamal

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0x19: Talk, Traits: Rich Packet Metadata
by Jamal Hadi Salim 06 Feb '25

06 Feb '25

skb metadata like the ->mark while versatile have limited space. Arthur Fabre, Jakub Sitnicki and Jesper Brouer propose what they refer to as "packet traits”, a bespoke key-value store for metadata, optimized for use within the XDP code. User-space access to the store is provided natively through an extension of the Linux Sockets API In this talk they will present the API features and performance characteristics of the packet traits KV store, backed by the existing packet headroom. They'll also explain how a shared key space, combined with a registration API, addresses the challenges of metadata merging in scenarios like GRO packet coalescing and IP fragment reassembly. The talk will discuss the user API for reading and writing packet traits and the design of a networking uAPI extension that supports both connection-oriented (TCP) and connectionless (UDP) sockets. The authors invested effort in ensuring ease of adoption by aligning with established Linux networking API patterns. More details: https://netdevconf.info/0x19/sessions/talk/traits-rich-packet-metadata.html cheers, jamal

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0X19: Workshop, AI Networks - RoCEv2 and the role of "netdev"
by Jamal Hadi Salim 05 Feb '25

05 Feb '25

David Ahern and Leon Romanovsky will chair a workshop on AI Networks with a focus on RoCEv2 and the role of "netdev". AI training requires high bandwidth and low latency networks and networking stacks since training times are highly dependent on tail latency. At 800 Gbps ethernet link ports, with multiple ports per system, the inefficiencies of using socket based interfaces are abundantly exposed. For that reason any solution that uses these traditional network interfaces is incapable of meeting the desired high bandwidth and low latency requirements. In this workshop, David and Leon will discuss the RoCEv2 protocol for AI training networks and the role of “netdev” and compare that effort in contrast to proposals to shunt device QPs to TCP[1] and devmem[2], io_uring[3]. More details here: https://netdevconf.info/0x19/sessions/workshop/ai-networks-rocev2-and-the-r… cheers, jamal [1]https://netdevconf.info/0x16/sessions/talk/merging-the-networking-worlds.html [2]https://netdevconf.info/0x17/sessions/talk/device-memory-tcp.html [3] https://netdevconf.info/0x17/sessions/talk/fast-zc-rx-data-plane-using-io-u…

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0x19: BoF, Low Latency Networking
by Jamal Hadi Salim 05 Feb '25

05 Feb '25

PJ will chair a session on Low Latency Networking. Low Latency is an important requirement for certain application types. These application types don’t have to be similar. In many cases, they are quite different. Achieving low latency behaviors for these use cases can be reached in different ways. The BoF will include discussions on: -use cases and their latency constraints -causes of latency and jitter in Linux -How to achieve low latency in various scenarios and setups cheers, jamal

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0x19: BoF, Your Fu is Better Than Mine!
by Jamal Hadi Salim 04 Feb '25

04 Feb '25

Folks, Because you asked, PJ is back with this fun session! Be not afraid friends, this is a safe space! A judgement-free zone ;-> PJ says: Come with your cool hacks, workflows, test harnesses, whatever. This is a place where all of us who have worked in this space for decades or months can converge, and share knowledge of how we work in this space better. If you’re interested, just bring a short demo. It could be a simple git workflow to show how you automate bisecting a driver issue with tests. Or a simple benchmark that you can show why it’s important to you. No judgements, just pure sharing. Often people in the audience get encouraged by who is presenting, and spontaneously decide to present something of theirs. cheers, jamal

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0x19: BoF, SRv6: review the current status and plan the future evolution
by Jamal Hadi Salim 04 Feb '25

04 Feb '25

Stefano Salsano will chair a BoF on the latest and greatest on SRv6 in the kernel, FRR and eBPF worlds. The agenda will include discussions on the current status and future plans. More details: https://netdevconf.info/0x19/sessions/bof/srv6-in-linux-kernel-frr-and-ebpf… cheers, jamal

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0x19: Workshop, Netfilter
by Jamal Hadi Salim 04 Feb '25

04 Feb '25

In this mini-workshop, Pablo Neira Ayuso will give us a summary of Netfilter updates since last NetDev Conference. cheers, jamal

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0x19: Tutorial, Diagnosing Page Pool Leaks
by Jamal Hadi Salim 03 Feb '25

03 Feb '25

Page pools have now become the standard way of doing memory management on the RX data path. Implementing page pool support in a NIC driver is not exactly rocket science but: Here be dragons! Dragos Tatulea had to go through baptism by fire so you dont have to! Come learn how to diagnose page pool leaks and how to drill down and nail the sources. Dragos will share the tools of trade he uses to chase those dragons. Details: https://netdevconf.info/0x19/sessions/tutorial/diagnosing-page-pool-leaks.h… cheers, jamal

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0x19: Tutorial, Using Packetdrill to Write Automated Tests for the Linux Networking Stack
by Jamal Hadi Salim 03 Feb '25

03 Feb '25

If you are a network developer or operator and have not used Packetdrill to write automated tests for the Networking Stack then you have been missing out. All is not lost! We are very lucky to have Neal Cardwell, who maintains Packetdrill, to give us a hands-on tutorial. Packetdrill, which is an open-source scripting tool, enables quick, precise, reproducible, automated unit tests for entire TCP/UDP/IPv4/IPv6 network stacks, from the system call layer down to the NIC hardware. More details: https://netdevconf.info/0x19/sessions/tutorial/tutorial-using-packetdrill-t… cheers, jamal

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0x19: New Silver sponsor! HAProxy
by Jamal Hadi Salim 03 Feb '25

03 Feb '25

To our friends at HAProxy, thank you for your kindness and continued support! Who is HAProxy? HAProxy Technologies is the company behind HAProxy, the world’s fastest and most widely used software load balancer. Rapidly deploy HAProxy products to deliver websites and applications with the utmost performance, observability, and security at any scale and in any environment. cheers, jamal

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